Patents Examined by Trevor Quick Coddington
  • Patent number: 6859534
    Abstract: This invention relates generally to a method and apparatus, as implemented by a software program on a computer system, for digitally producing counterfeit-deterring scrambled or coded indicia images, typically in a printed form. This method and system are capable of combining a source image with a latent image so the scrambled latent image is visible only when viewed through a special decoder lens. The digital processing allows different latent images to be encoded according to different parameters. Additionally, latent images might be encoded into single component colors of an original visible image, at various angles from each other. A second embodiment teaches a method of forming an optical surface having diffraction properties that vary over the optical surface in accordance with a security graphic image that includes an encoded recognizable indicium formed as a parallax panoramagram image through a lenticular line screen.
    Type: Grant
    Filed: January 12, 1998
    Date of Patent: February 22, 2005
    Inventor: Alfred Alasia
  • Patent number: 6178242
    Abstract: A system for producing an output scrambled digital data stream from an input scrambled digital data stream. The input scrambled digital data stream includes a plurality of control messages (ECMs), each ECM including coded information for generating a control word (CW) associated with the ECM and being encoded using an ECM key. The input scrambled digital data stream also includes a plurality of segments of scrambled digital data, each segment of scrambled digital data being associated with one of the plurality of ECMs and being scrambled using the CW associated with the ECM.
    Type: Grant
    Filed: January 28, 1998
    Date of Patent: January 23, 2001
    Assignee: NDS Limited
    Inventor: Yossef Tsuria
  • Patent number: 6154841
    Abstract: A system for enabling verified or verifiable communications while maintaining anonymity, in which a common public parameter, such as a prime number, and a registered signature are changed, respectively, by a specifier and a signer to provide a digital signature which accompanies a message sent from the signer to a verifier.
    Type: Grant
    Filed: April 25, 1997
    Date of Patent: November 28, 2000
    Assignee: Canon Kabushiki Kaisha
    Inventor: Kazuomi Oishi
  • Patent number: 6101605
    Abstract: To perform a secure operation, an original encrypted value is obtained from a memory. The original encrypted value is decrypted to obtain an original value and an original validity code. The original validity code is compared with a stored validity code. If the original validity code is equivalent to the stored validity code, the secure operation is performed on the original value to produce a new value. Then a permanent alteration is made to the stored validity code to produce a new stored validity code. The new value and the new stored validity code are encrypted to produce a new encrypted value. The new encrypted value is stored in the memory.
    Type: Grant
    Filed: May 15, 1997
    Date of Patent: August 8, 2000
    Assignee: VLSI Technology, Inc.
    Inventor: Mark Leonard Buer
  • Patent number: 6094483
    Abstract: A method of encryption features the steps of first encrypting a message and then hiding (embedding) it within a digital image carrier. This is accomplished by only slightly changing the gray levels of the image carrier. The changes are imperceptible to the human eye, because they appear as random thermal noise that is commonly present in digitized images.
    Type: Grant
    Filed: August 6, 1997
    Date of Patent: July 25, 2000
    Assignee: Research Foundation of State University of New York
    Inventors: Jiri Fridrich, Richard J. Simard
  • Patent number: 6081599
    Abstract: A television scrambling system in which a television signal is scrambled by means of placing a scrambling (or jamming) signal into the luminance signal spectrum on the transmit side. On the receive side, the jamming signal is removed by a Surface Acoustic Wave (SAW) notch filter. On the transmit side, pre-correction of the television signal is performed to compensate for amplitude and phase distortions introduced by the SAW notch filter.
    Type: Grant
    Filed: December 1, 1997
    Date of Patent: June 27, 2000
    Assignees: Tresness Irrevocable Patent Trust, Telecom
    Inventor: Victor M. Zinevitch
  • Patent number: 6078664
    Abstract: Z-transform calculations may be used to encode (and/or decode) carrier signal independent data (e.g., digital watermarks) to a digital sample stream. Deterministic and non-deterministic components of a digital sample stream signal may be analyzed for the purposes of encoding carrier signal independent data to the digital sample stream. The carrier signal independent data may be encoded in a manner such that it is restricted or concentrated primarily in the non-deterministic signal components of the carrier signal. The signal components can include a discrete series of digital samples and/or a discreet series of carrier frequency sub-bands of the carrier signal. Z-transform calculations may be used to measure a desirability of particular locations and a sample stream in which to encode the carrier signal independent data.
    Type: Grant
    Filed: December 20, 1996
    Date of Patent: June 20, 2000
    Inventors: Scott A. Moskowitz, Marc S. Cooperman
  • Patent number: 6075859
    Abstract: In a communications system, a method of transforming a set of message signals representing a message comprising the steps of first encoding one of the set of message signals in accordance with a first keyed transformation, a second encoding of the one of the set of message signals in accordance with at least one additional keyed transformation, a third encoding of the one of the set of message signals in accordance with a self inverting transformation in which at least one of the set of message signals is altered, a fourth encoding of the one of the set of message signals in accordance with at least one additional inverse keyed transformation wherein each of the at least one additional inverse keyed transformation is a corresponding inverse of at least one additional keyed transformation, and fifth encoding the one of the set of message signals in accordance with first inverse keyed transformation wherein the first inverse keyed transformation is the inverse of the first keyed transformation.
    Type: Grant
    Filed: March 11, 1997
    Date of Patent: June 13, 2000
    Assignee: QUALCOMM Incorporated
    Inventor: Gregory G. Rose
  • Patent number: 6072872
    Abstract: A signal such as an analog scrambled television signal in a cable television network has first scrambling mode data which is compatible with a first decoder population, but not a second decoder population. The scrambled television signal is processed to determine the scrambling mode without recovering the first scrambling mode data. Second scrambling mode data which is compatible with the second decoder population is then provided in the scrambled television signal, for example, in the vertical blanking interval or on an audio subcarrier. During processing to determine the scrambling mode, the television signal is delayed, e.g., by digitizing it and temporarily storing it in memory. The delay compensates for the time required to determine the scrambling mode. The television signal is recovered in the analog domain prior to inserting the second scrambling mode data.
    Type: Grant
    Filed: January 27, 1998
    Date of Patent: June 6, 2000
    Assignee: General Instrument Corporation
    Inventors: Kevin T. Chang, Alfred W. Stufflet
  • Patent number: 6055315
    Abstract: A scrambling system for a cable television system in which a group of channel frequencies are reused over a plurality of service areas includes an access controller, an encoder and a plurality of simplified scrambling units. Each service area receives different television signals on the group of channel frequencies. The access controller provides signal authorization information for a given channel frequency to a plurality of receiver/decoders located in the different services areas. The access controller also provides descrambling information corresponding to the signal authorization information to the encoder for the given channel frequency. The encoder produces a conditional access code by placing the descrambling information into a scrambled reference signal. An extracting unit removes the conditional access code from the scrambled reference signal and distributes the conditional access code to each of the simplified scrambling units operating at the given channel frequency.
    Type: Grant
    Filed: December 7, 1998
    Date of Patent: April 25, 2000
    Assignee: ICTV, Inc.
    Inventors: John F. Doyle, Stephen C. Snell, Timothy Dunn
  • Patent number: 6052468
    Abstract: A method is disclosed for improving portability of secure encryption key data files. The method provides for re-securing key data files according to different security processes for mobility. For porting an encryption key secured using a fingerprint authentication process to a system having only a password authentication process, a user selects password authentication process, provides a fingerprint and is authorised, provides a new password and then the encryption key is accessed according to the fingerprint authentication process and secured according to the password authentication process. This allows the use of specialised security hardware at one location while retaining an ability to transport encryption keys in a secure fashion to other locations, which do not have similar security hardware.
    Type: Grant
    Filed: January 15, 1998
    Date of Patent: April 18, 2000
    Assignee: DEW Engineering and Development Limited
    Inventor: Robert D. Hillhouse
  • Patent number: 6049874
    Abstract: A system backs up computer files to a remote site via modem, LAN, WAN, or other network device 16. Files of a user computer that are found in a common library at the remote site initially are not copied to the remote site, whereas files not in the library are copied to the remote site and potentially automatically added to the library when a sufficient number of computers contain the files. Then, periodically or continuously if the user is online via the modem, the user computer determines which blocks have been changed, and the user computer transmits only changed blocks to the remote site. The blocks are gathered in "chunk" files, and when a chunk file reaches a predetermined size, it is transmitted to the remote site for updating the back up version of the respective file. The process then resumes identifying changed blocks.
    Type: Grant
    Filed: March 12, 1998
    Date of Patent: April 11, 2000
    Assignee: Fairbanks Systems Group
    Inventors: Fred W. McClain, Thomas B. Bolt
  • Patent number: 6047375
    Abstract: A computer system having multiple processors wired to a common MCM substrate in which insertable processor chips themselves carry fencing appropriate to their function on the multi-chip module in which they are inserted for optimizing needed functions with fencing of interfaces to permit cryptographic functions to be added by inserting a cryptographic by providing each processor of the multichip module with its own cryptographic coprocessor as needed enabling alternative configurations of the computer system using a common substrate but differing processing units and cryptographic coprocessors.
    Type: Grant
    Filed: March 4, 1998
    Date of Patent: April 4, 2000
    Assignee: International Business Machines Corporation
    Inventors: Randall Jay Easter, James Walter Bode
  • Patent number: 6044157
    Abstract: A microprocessor used in an image information processing system is provided. The microprocessor includes: decryption unit 59 for decrypting the encrypted compressed AV data; IDCT unit 58 for performing an inverse DCT to decompress the decrypted compressed AV data; and microprogram memory 54 for storing microprograms for executing the AV data reproduction instruction which performs decryption and decompression of the encrypted compressed AV data inseparably by using the decryption unit 59 and IDCT unit 58.
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: March 28, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasushi Uesaka, Kazuhiko Yamauchi, Masayuki Kozuka, Nobuo Higaki, Koichi Horiuchi, Syusuke Haruna
  • Patent number: 6038665
    Abstract: A portable computer back up system copies user-selected files for back up as the computer is being used, and when the computer senses a network connection and the network is relatively available, the blocks of the files to be backed up are interleaved with, e.g., metadata and transmitted to a remote facility via the network. The back up system suspends the backing up of files if a disk space limit is reached, transmits any copied files when the network is available, deleting the back up copies of the files from disk, and then resumes copying files for back up. Also, each time the portable computer is connected to a network, it determines what other devices are on the network, and if the computer recognizes the network configuration, the computer reconfigures its settings as appropriate for, e.g., printing to the printer that happens to be connected to the particular network to which the portable computer is connected at the time.
    Type: Grant
    Filed: June 19, 1998
    Date of Patent: March 14, 2000
    Assignee: Fairbanks Systems Group
    Inventors: Thomas B. Bolt, Fred W. McClain
  • Patent number: 6035044
    Abstract: A scrambling type video transmitting/receiving method feasible for digital television broadcasting and an apparatus therefor are disclosed. A video transmitter executes soft scrambling with an original video signal before compressing it and then sends the softly scrambled video signal. If a video receiver descrambles the scrambled data with a scramble decoder (descrambler), a subscriber having the receiver can enjoy complete video/audio data. However, when an unauthorized person lacking the scramble decoder decodes the descrambled data, the person is allowed to see only some patterns included in a picture. This will successfully encourage the unauthorized person to make subscription so as to enjoy the complete video/audio data.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: March 7, 2000
    Assignee: NEC Corporation
    Inventor: Satoshi Itoi
  • Patent number: 6021199
    Abstract: Of I, P, and B pictures contained in an MPEG 2 data stream, only the I picture is subjected to encryption such as scramble processing. Scramble rule data used at that time is stored in the lead-in area of an optical disk. A software DVD decoder reads the scramble rule data stored in the lead-in area, and its certification control module descrambles only the I picture. With this processing, the CPU power required for descramble processing can be reduced, and motion picture data can be decoded by the software DVD decoder in real time.
    Type: Grant
    Filed: October 14, 1997
    Date of Patent: February 1, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yasuhiro Ishibashi
  • Patent number: 6021203
    Abstract: A protocol is provided for transmitting low security messages and high security messages with one-time-pad cryptosystem. In one implementation of the present invention, low security messages are encrypted using random bit strings in accordance with a one-time-pad encryption scheme. A high security message and a decoy message are embedded within a set of encryption keys and cyphertexts that is to be transmitted from a sender to a receiver. The encryption keys are transmitted over a secure channel from the sender to the receiver, and the cyphertexts are transmitted over a publicly accessible channel from the sender to the receiver. The receiver uses the encryption keys and knowledge regarding keys for a high security message and a decoy message to decrypt the low security messages, extract the high security message and/or decoy message, and decrypt the high security message and/or decoy message.
    Type: Grant
    Filed: December 11, 1996
    Date of Patent: February 1, 2000
    Assignee: Microsoft Corporation
    Inventors: John R. Douceur, Michael P. Calligaro, Matthew W. Thomlinson
  • Patent number: 6009175
    Abstract: A plurality of client-terminals are connected to utilize the facilities of a client-server and a Kerberos Server in a Kerberos domain. A client-terminal requesting Kerberos service is facilitated by cooperating programs designated as the communications management system program (COMS) and the Menu Assisted Resource Control program (MARC) which enable access to a Kerberos Server for building a response message to said requesting client-terminal without disabling continued usage of said client-terminal.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: December 28, 1999
    Assignee: Unisys Corporation
    Inventor: Martin Lee Schanze
  • Patent number: 5987125
    Abstract: Seismic survey data is stored in encrypted format in a first memory. The first memory module is transferred to a first computer in a first location. A portion of the seismic survey data is selected using a second computer in the first location, wherein the second computer communicates with a second location. A request authorization is transmitted from the second computer to the second location. A decryption code is transmitted from the second location to the second computer. The decryption code is transferred from the second computer to the first computer. The decryption code is applied to the selected portion of seismic survey data in the first computer, making available seismic survey data in decrypted format.
    Type: Grant
    Filed: December 15, 1997
    Date of Patent: November 16, 1999
    Assignee: Western Atlas International, Inc.
    Inventors: J. Haynie Stringer, Gary Lynn Fair